Last updated: May 2025
Twin Hearts ("we", "our", or "us") is a twin pregnancy companion app for expectant parents. This Privacy Policy explains what information we collect, how we use it, and your rights regarding that information.
1. Information We Collect
We collect information you provide directly when using the app:
- Account information: your name and email address, used to create and identify your account.
- Pregnancy information: due date, gestational week, and pregnancy-related preferences.
- Health data: maternal weight logs, blood pressure readings, symptom entries, baby kick counts, and scan measurements you choose to enter.
- Journal entries: notes, memories, and milestones you write within the app.
- Appointment records: upcoming appointments and visit notes you add.
- Sonogram images: ultrasound photos you upload, stored locally on your device only.
- Push notification token: a device identifier used to deliver reminders and notifications you enable.
We do not collect any information without your direct input.
2. How We Use Your Information
We use the information you provide solely to:
- Operate and personalise the Twin Hearts app experience for you and your partner.
- Sync your pregnancy data between devices linked to the same pregnancy.
- Send you reminders and push notifications you have opted into (supplements, appointments, weekly milestones).
- Power AI-assisted features (the "Twin Hearts AI" chat) by sending your anonymised query to Anthropic's API — we do not send your personal health records to any AI service.
We do not sell, rent, or share your personal information with third parties for marketing purposes.
3. Data Storage and Security
Your data is stored securely using Google Firebase (Firestore), a cloud database hosted on Google's infrastructure. Access to your pregnancy data is restricted by security rules so that only you and your linked partner can read or write it.
Sonogram images are stored locally on your device and are never uploaded to our servers.
We use industry-standard encryption (TLS) for all data in transit.
4. Third-Party Services
Twin Hearts uses the following third-party services, each governed by their own privacy policies:
- Google Firebase / Firestore — data storage and authentication (firebase.google.com/support/privacy)
- Google Sign-In — optional sign-in method (policies.google.com/privacy)
- Expo / EAS — app build and notification delivery (expo.dev/privacy)
- Anthropic — AI chat feature, processes anonymised queries only (anthropic.com/privacy)
5. Data Retention
Your data is retained for as long as your account is active. You may delete your account and all associated data at any time by contacting us at the email below. We will action deletion requests within 30 days.
6. Children's Privacy
Twin Hearts is intended for use by adults (expectant parents aged 18 and over). We do not knowingly collect information from children under 13. If you believe a child has provided us with personal information, please contact us so we can delete it.
7. Your Rights
Depending on your location, you may have the right to:
- Access the personal data we hold about you.
- Request correction of inaccurate data.
- Request deletion of your data.
- Withdraw consent for data processing at any time.
To exercise any of these rights, contact us at hello@twin-hearts.com.
8. Changes to This Policy
We may update this Privacy Policy from time to time. When we do, we will update the "Last updated" date at the top of this page. Continued use of the app after changes constitutes acceptance of the updated policy.
9. Contact Us
If you have any questions about this Privacy Policy or how we handle your data, please contact us:
- Email: hello@twin-hearts.com
- Website: twin-hearts.com